FrankD,
Yes, at the moment, most folks have what we call the national release which is the same version that you are using at the moment. When a new National Release is ready, then it will usually be sent down to some number of folks .. I the last cycle, it was randomly sent to folks, but in previous national releases, the release followed geographical regions.
After the initial release, if things have gone well, then about a week later (sometimes two) the new national release is made available to all receivers. So basically when a new national release is made available, all receivers will start downloading it.